As we have been talking lately, there is much confussion about when to use the future with 'will' or with 'going to'. So here are two different videos. In one of them(Mark Roberts_he gives good explanations), the differences are explained very clearly, and some different uses are mentioned.
However, in the other, the girl tells us that you can always use both of them, except when you decide something very quickly. That's because she 's probably American, and they don't distinguish the future.